Crosshair
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A crosshair is a small shape (typically a "+" plus sign, right angle, or circle) that aids in aiming firearms, and occasionally for alignment purposes.
Crosshairs are also a very common subject on computer games, tipically first-person shooters. Most of these games implement some form of crosshair so that players can aim accurately. Versions of popular games with no crosshairs exist, as a more challenging game mode - Quake 2 Iron Sights, for example.